am335x_ecap.c

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    1 /*-
    2  * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/limits.h>
   35 #include <sys/lock.h>
   36 #include <sys/module.h>
   37 #include <sys/mutex.h>
   38 #include <sys/resource.h>
   39 #include <sys/rman.h>
   40 #include <sys/sysctl.h>
   41 
   42 #include <machine/bus.h>
   43 
   44 #include <dev/ofw/openfirm.h>
   45 #include <dev/ofw/ofw_bus.h>
   46 #include <dev/ofw/ofw_bus_subr.h>
   47 
   48 #include "am335x_pwm.h"
   49 
   50 #define ECAP_TSCTR              0x00
   51 #define ECAP_CAP1               0x08
   52 #define ECAP_CAP2               0x0C
   53 #define ECAP_CAP3               0x10
   54 #define ECAP_CAP4               0x14
   55 #define ECAP_ECCTL2             0x2A
   56 #define         ECCTL2_MODE_APWM                (1 << 9)
   57 #define         ECCTL2_SYNCO_SEL                (3 << 6)
   58 #define         ECCTL2_TSCTRSTOP_FREERUN        (1 << 4)
   59 
   60 #define ECAP_READ2(_sc, reg)    bus_read_2((_sc)->sc_mem_res, reg);
   61 #define ECAP_WRITE2(_sc, reg, value)    \
   62     bus_write_2((_sc)->sc_mem_res, reg, value);
   63 #define ECAP_READ4(_sc, reg)    bus_read_4((_sc)->sc_mem_res, reg);
   64 #define ECAP_WRITE4(_sc, reg, value)    \
   65     bus_write_4((_sc)->sc_mem_res, reg, value);
   66 
   67 #define PWM_LOCK(_sc)           mtx_lock(&(_sc)->sc_mtx)
   68 #define PWM_UNLOCK(_sc)         mtx_unlock(&(_sc)->sc_mtx)
   69 #define PWM_LOCK_INIT(_sc)      mtx_init(&(_sc)->sc_mtx, \
   70     device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF)
   71 #define PWM_LOCK_DESTROY(_sc)   mtx_destroy(&(_sc)->sc_mtx)
   72 
   73 static device_probe_t am335x_ecap_probe;
   74 static device_attach_t am335x_ecap_attach;
   75 static device_detach_t am335x_ecap_detach;
   76 
   77 struct am335x_ecap_softc {
   78         device_t                sc_dev;
   79         struct mtx              sc_mtx;
   80         struct resource         *sc_mem_res;
   81         int                     sc_mem_rid;
   82 };
   83 
   84 static struct ofw_compat_data compat_data[] = {
   85         {"ti,am3352-ecap",      true},
   86         {"ti,am33xx-ecap",      true},
   87         {NULL,                  false},
   88 };
   89 SIMPLEBUS_PNP_INFO(compat_data);
   90 
   91 static device_method_t am335x_ecap_methods[] = {
   92         DEVMETHOD(device_probe,         am335x_ecap_probe),
   93         DEVMETHOD(device_attach,        am335x_ecap_attach),
   94         DEVMETHOD(device_detach,        am335x_ecap_detach),
   95 
   96         DEVMETHOD_END
   97 };
   98 
   99 static driver_t am335x_ecap_driver = {
  100         "am335x_ecap",
  101         am335x_ecap_methods,
  102         sizeof(struct am335x_ecap_softc),
  103 };
  104 
  105 /*
  106  * API function to set period/duty cycles for ECAPx
  107  */
  108 int
  109 am335x_pwm_config_ecap(int unit, int period, int duty)
  110 {
  111         device_t dev;
  112         struct am335x_ecap_softc *sc;
  113         uint16_t reg;
  114 
  115         dev = devclass_get_device(devclass_find(am335x_ecap_driver.name), unit);
  116         if (dev == NULL)
  117                 return (ENXIO);
  118 
  119         if (duty > period)
  120                 return (EINVAL);
  121 
  122         if (period == 0)
  123                 return (EINVAL);
  124 
  125         sc = device_get_softc(dev);
  126         PWM_LOCK(sc);
  127 
  128         reg = ECAP_READ2(sc, ECAP_ECCTL2);
  129         reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL;
  130         ECAP_WRITE2(sc, ECAP_ECCTL2, reg);
  131 
  132         /* CAP3 in APWM mode is APRD shadow register */
  133         ECAP_WRITE4(sc, ECAP_CAP3, period - 1);
  134 
  135         /* CAP4 in APWM mode is ACMP shadow register */
  136         ECAP_WRITE4(sc, ECAP_CAP4, duty);
  137         /* Restart counter */
  138         ECAP_WRITE4(sc, ECAP_TSCTR, 0);
  139 
  140         PWM_UNLOCK(sc);
  141 
  142         return (0);
  143 }
  144 
  145 static int
  146 am335x_ecap_probe(device_t dev)
  147 {
  148 
  149         if (!ofw_bus_status_okay(dev))
  150                 return (ENXIO);
  151 
  152         if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
  153                 return (ENXIO);
  154 
  155         device_set_desc(dev, "AM335x eCAP");
  156 
  157         return (BUS_PROBE_DEFAULT);
  158 }
  159 
  160 static int
  161 am335x_ecap_attach(device_t dev)
  162 {
  163         struct am335x_ecap_softc *sc;
  164 
  165         sc = device_get_softc(dev);
  166         sc->sc_dev = dev;
  167 
  168         PWM_LOCK_INIT(sc);
  169 
  170         sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  171             &sc->sc_mem_rid, RF_ACTIVE);
  172         if (sc->sc_mem_res == NULL) {
  173                 device_printf(dev, "cannot allocate memory resources\n");
  174                 goto fail;
  175         }
  176 
  177         return (0);
  178 
  179 fail:
  180         PWM_LOCK_DESTROY(sc);
  181         return (ENXIO);
  182 }
  183 
  184 static int
  185 am335x_ecap_detach(device_t dev)
  186 {
  187         struct am335x_ecap_softc *sc;
  188 
  189         sc = device_get_softc(dev);
  190 
  191         PWM_LOCK(sc);
  192         if (sc->sc_mem_res)
  193                 bus_release_resource(dev, SYS_RES_MEMORY,
  194                     sc->sc_mem_rid, sc->sc_mem_res);
  195         PWM_UNLOCK(sc);
  196 
  197         PWM_LOCK_DESTROY(sc);
  198 
  199         return (0);
  200 }
  201 
  202 DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, 0, 0);
  203 MODULE_VERSION(am335x_ecap, 1);
  204 MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/arm/ti/am335x/am335x_ecap.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/am335x/am335x_ecap.c